<template>
  <div class="component-upload-image">
    <el-upload
      ref="imageUploadRef"
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :before-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon">
        <plus />
      </el-icon>
    </el-upload>

    <div v-if="showTip" class="el-upload__tip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
      </template>
      的文件
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script setup name="ImageUpload">
  import { ref, computed, watch, defineEmits } from 'vue';
  import { getToken } from '@/utils/auth';
  import modal from '@/plugins/modal';

  const props = defineProps({
    modelValue: [String, Object, Array],
    limit: {
      type: Number,
      default: 5,
    },
    fileSize: {
      type: Number,
      default: 100,
    },
    fileType: {
      type: Array,
      default: () => ['webp', 'gif', 'tif', 'bmp', 'png', 'jpg', 'jpeg'],
    },
    isShowTip: {
      type: Boolean,
      default: true,
    },
  });

  const emit = defineEmits(['update:modelValue', 'success']);

  const imageUploadRef = ref(null);
  const number = ref(0);
  const uploadList = ref([]);
  const dialogImageUrl = ref('');
  const dialogVisible = ref(false);
  const baseUrl = import.meta.env.VITE_APP_BASE_API;
  const uploadImgUrl = ref(baseUrl + '/web/common/upload');
  const headers = ref({ Authorization: 'Bearer ' + getToken() });
  const fileList = ref([]);
  const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

  watch(
    () => props.modelValue,
    (val) => {
      if (val) {
        const list = Array.isArray(val) ? val : props.modelValue.split(',');
        fileList.value = list.map((item) => {
          if (typeof item === 'string') {
            if (item.indexOf(baseUrl) === -1) {
              item = {
                name: baseUrl + item,
                src: baseUrl + item,
                url: baseUrl + item + `?accessToken=${getToken()}`,
              };
            } else {
              item = {
                name: item,
                src: item,
                url: item,
              };
            }
          }
          return item;
        });
      } else {
        fileList.value = [];
        return [];
      }
    },
    { deep: true, immediate: true },
  );

  function handleBeforeUpload(file) {
    let isImg = false;
    if (props.fileType.length) {
      let fileExtension = '';
      if (file.name.lastIndexOf('.') > -1) {
        fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
      }
      isImg = props.fileType.some((type) => {
        if (file.type.indexOf(type) > -1) {
          return true;
        }
        if (fileExtension && fileExtension.indexOf(type) > -1) {
          return true;
        }
        return false;
      });
    } else {
      isImg = file.type.indexOf('image') > -1;
    }
    if (!isImg) {
      modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`);
      return false;
    }
    if (props.fileSize) {
      const isLt = file.size / 1024 / 1024 < props.fileSize;
      if (!isLt) {
        modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
        return false;
      }
    }
    modal.loading('正在上传图片，请稍候...');
    number.value++;
    return true;
  }

  function handleExceed() {
    modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
  }

  function handleUploadSuccess(res, file) {
    if (res.code === 200) {
      uploadList.value.push({
        name: res.fileName,
        src: res.fileName,
        url: res.fileName + `?accessToken=${getToken()}`,
      });
      uploadedSuccessfully();
      emit('success', { res, file });
    } else {
      number.value--;
      modal.closeLoading();
      modal.msgError(res.msg);
      imageUploadRef.value?.handleRemove(file);
      uploadedSuccessfully();
    }
  }

  function handleDelete(file) {
    const findex = fileList.value.map((f) => f.name).indexOf(file.name);
    if (findex > -1 && uploadList.value.length === number.value) {
      fileList.value.splice(findex, 1);
      emit('update:modelValue', listToString(fileList.value));
      return false;
    }
  }

  function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
      fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
      uploadList.value = [];
      number.value = 0;
      emit('update:modelValue', listToString(fileList.value));
      modal.closeLoading();
    }
  }

  function handleUploadError() {
    modal.msgError('上传图片失败');
    modal.closeLoading();
  }

  function handlePictureCardPreview(file) {
    dialogImageUrl.value = file.url;
    dialogVisible.value = true;
  }

  function listToString(list, separator) {
    let strs = '';
    separator = separator || ',';
    for (let i in list) {
      if (undefined !== list[i].src && list[i].src.indexOf('blob:') !== 0) {
        strs += list[i].src.replace(baseUrl, '') + separator;
      }
    }
    return strs != '' ? strs.substr(0, strs.length - 1) : '';
  }
</script>

<style scoped lang="scss">
  // .el-upload--picture-card 控制加号部分
  :deep(.hide .el-upload--picture-card) {
    display: none;
  }
</style>
